Courtney01: Here is a question and i cant seem to find the answer, Is sandbagging against the rules?
News, Sept. 2010
Note, these new Tiers & Levels are not designed to address sandbagging (players misrepresenting their ability to gain advantage in tournaments and match play). While these changes will help make sandbagging harder and discourage "quitting" in multi-player games, we're working on other improvements to address sandbagging by monitoring score histories and sandbagging behaviors, and addressing violations to our community policies more aggressively.
I don't know if that qualifies as a "rule," but that's their policy. Complaining about specific players (like that L90 hack) in the forums is all well and good, but I would report them to WGT.